Make ( ) copies of important fi les,and store them on separate locations to protect your information.

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问题 Make (    ) copies of important fi les,and store them on separate locations to protect your information.

选项 A、back
B、back.up
C、back.out
D、background

答案B

解析 对重要文件要做备份,并保存于另地,以保护你的信息。
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